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IMPROVEMENT IN STEAM ROTARY-VALVES.

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.lO ALL WI-IOM IT MAY CONCERN:

Ile it known that I, R. F. BROWN, of Savannah, in the county of Chatham, and State of Georgia., have invented a new and useful Improvement Ain Equilibrium Steam-Valve; and I do hereby declare that the t`ollow-I ing is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates te the arrangement ot the ways of the oscillating steam-valve and its seat, and the peculiar` manner in which an equilibrium of pressure upon the valve is obtained; and the invention consists in the arrangement of the valve, with apertures for the admission and exhaust of the steam, in such a manner that the steam presses equally, or nearly so, upon each side of the valve, as will be hereinafter described.

Figure 1 represents a view of the steam-chest with the valve in place.

Figure 2 shows a cross-section of tig. 3 through the line :v fr, showing thc-valveseat andthe steam-ports closed.

Figure 3 is a longitudinal section through the line y l of fig. 2.

Figure 4 is a cross-section through thc line e e of iig. 6.

Figure 5 is the same as tig. 2, showing valve-scat and the steam-ports open.

Figure G is a longitudinal section of the valve detached, it 1seing through the line z z of iig. 7.

Figure 7 is a side view or" the valve, showing one of the steam apertures on the sides of the valve.

Similar letters of reference indicate like parts.

.ik represents the valve-chest. A' is the valve-seat. B is the valve. C represent-s the steam-ports leading to thc cylinder. D is the exhaust-port. E is the aperture by which the steam enters the chest. The valve B itselfis a more skeleton. The apparatus and recesses are connected together in such a manner that the steam presses ecp-,rally upon it whenit stands as sccn in fig. 2, and at all times, and when exhausting, as seen in tig. 5, the exhausting steam reacts against the shell or scat at o. The steam passes into the chest through the aperture E, and around the upper portion oi' the seat a, and through the head of thc valve to the other side, when the cylinder takes steam through the right-hand port, as seen in iig. 5. The steam exhausts into a. slot, l?, which passes entirely through the valve, and which extends nearly its whole interior length. This aperture through the valve is seen in iig. (3. The apertures through which the cylinder takes steam are seen in iigs. 2 and 5, marked c, and in shaded lines in 6 and 7. These apertures pass round both ends of the exhaustopening, both ends of the valve being hollow, with solid or entire ends, as shown in tig. 6. The base of these side apertures is enlarged, as seen, which allows `freer ingress und egress of the steam. Longitudinally the exhaust-opening of the vulve is entirely surrounded by steam, and on its sides the pressure is always balanced. This 'c is operated by a lever which receives its motion from a rock-shaft or eccentric, or from any other part he machinery, and it is made to oscillate in its seat, by which motion it opens and closes the ports of the cylinder. j', fig. 3, represents a. cap on the large end of the valve. Through this cap there is a set-screw, g, the inner end of which is made to operato on the valve, keeping it thereby suilieiently tight in its seat. 7L is an arm on thc other end of the valve by which the valve is oscillatcd. This arm is fastened by a. set-screw, k. Ihc course of the steam through thc valve and thc ports is indicated by arrows, and the operation of the valve will he readily understood by those acquainted with the subject. The seat of the valve A is plainly shown in section in figs. 2 and 5. It will be seen that tho steam passes entirely round its upper portion, while the valve is relieved ol the usual friction against it by the pressure in opposite directions.

Having thus described my invention, what l claimns new, and desire to secure by Letters Patent, is

The arrangement of thc induction passage E, cduction passage-D, with reference to the passages C C and thc valve B, substantially upon thc principle and in the manner as herein `set forth.

R. F. BROWN.'

Witnesses:

WM. F. Moons, Cunas. COLLINS. 

